#enzyme

• Abderhalden reaction — A medical eponym linked to the biochemist Emil Abderhalden, used to denote the immunological defense reaction (Abderhalden reaction) based on protective enzymes in the serum, previously used for the early diagnosis of pregnancy or certain oncological and psychiatric conditions (such as dementia praecox). The term also defines the Abderhalden-Kaufmann-Lignac syndrome, a rare congenital metabolic disorder characterized by cystinosis and renal dwarfism.
• Acrosome — A vesicular cellular formation, resembling a specialized lysosome, located as a cap or protective envelope on the anterior portion of the spermatozoon head nucleus. This structural organelle, derived from the Golgi apparatus during spermiogenesis, contains a large amount of potent hydrolytic enzymes (such as hyaluronidase and acrosin) destined to dissolve the outer protective zones of the ovum (zona pellucida) to allow penetration and biological fertilization.
• Adermin — An alternative or historical scientific name granted to vitamin B6 (specifically pyridoxine), an organic compound essential for cellular metabolism. This element plays a crucial structural and functional role in the body, acting as a major coenzyme in the synthesis of amino acids, neurotransmitters, and hemoglobin, being so named due to its demonstrated capacity to prevent or cure severe dermatological disorders.
• Aldolase — An enzyme belonging to the lyase class that catalyzes the reversible cleavage of fructose-1,6-bisphosphate into two triose phosphates (glyceraldehyde-3-phosphate and dihydroxyacetone phosphate), a core step in the glycolytic pathway. Clinical measurements of its serum levels are utilized to diagnose acute muscle or hepatic disorders.
• Aldolasemia — The presence of the enzyme called aldolase in the circulating blood; in a clinical sense, the term refers to the numerical value or concentration of this enzyme in the patient's plasma. Fluctuations in this value indicate the integrity level of cellular membranes in striated muscle and hepatic tissues.
• Aleuronic — Pertaining to aleurone, belonging to aleurone, or containing a large amount of reserve protein granules. In structural plant biology, the term describes tissues, cells, or seminal layers defined by intense enzymatic activity and the presence of nitrogenous crystalloid inclusions involved in plant germinative metabolism.
• Allostery — A biochemical phenomenon or structural property of certain proteins (specifically enzymes and receptors) whereby the binding of an effector molecule (ligand) at a specific site (allosteric site) indices a spatial conformational change in another area of the molecule, directly altering its affinity and biological activity at the active site.
• Amidase — An enzyme belonging to the hydrolase class that catalyzes the hydrolytic cleavage of a linear amide bond, converting an amide compound into a carboxylic acid and ammonia or a corresponding amine. This biocatalyst plays an essential structural role in nitrogen metabolism, cellular detoxification processes, and industrial biocatalysis used for the enantioselective synthesis of high-purity pharmaceutical compounds.
• Amylase — An enzyme belonging to the hydrolase class that catalyzes the cleavage of alpha-1,4 glycosidic bonds in polysaccharides such as starch and glycogen, converting them into simpler carbohydrates (maltose, dextrins, and glucose). In the human body, it is structurally secreted mainly by the salivary glands (salivary amylase or ptyalin) and the exocrine pancreas (pancreatic amylase), playing an essential role in initiating and carrying out the chemical digestive process.
• Aminopeptidase — An enzyme of the exopeptidase class that catalyzes the specific hydrolysis of peptide bonds at the free N-terminal end of a polypeptide chain, successively releasing terminal amino acids. This biocatalyst plays an essential structural role in the final phases of protein digestion within the intestinal mucosa, as well as in intracellular protein degradation and recycling processes.
• Androgalactosemia — An extremely rare hereditary metabolic condition manifested exclusively in male patients, characterized by the organism's structural inability to correctly metabolize galactose due to a specific enzyme deficiency linked to the X chromosome or influenced by androgen hormones, leading to toxic compounds accumulation.
• Anticollagenase — A biological substance, inhibitory enzyme, or cosmetic agent that blocks, neutralizes, or reduces the activity of collagenase (the enzyme responsible for breaking down collagen in tissues). In dermatology and advanced anti-aging cosmetics, anticolagenase substances are structurally utilized to protect the skin's extracellular matrix, maintaining its firmness and elasticity and preventing wrinkle formation.
• Antiferment — An archaic or historical name used in biochemistry to designate an anti-enzyme or enzyme inhibitor; an organic substance capable of blocking, delaying, or neutralizing the catalytic action of a ferment (enzyme). Broadly, it describes chemical compounds that halt organic decomposition or microbial fermentation processes.
• Antimetabolite — A natural or synthetic chemical substance whose molecular structure closely resembles that of an essential metabolite in the body, capable of blocking, competing with, or inhibiting its normal utilization in cellular processes; in a clinical sense, it is used in chemotherapy (such as methotrexate or fluorouracil) to sabotage DNA synthesis in tumor cells.
• Antipepsin — An antibody, specific antibody, or biological substance with an inhibitory role that neutralizes the enzymatic activity of pepsin to digest proteins. This structural factor protects the gastric mucosa from self-digestion and is used in clinical research to study homeostatic mechanisms within the stomach.
• Antitrypsin — A plasma glycoprotein synthesized primarily by liver cells, having the essential physiological role of inhibiting the activity of proteolytic enzymes, especially trypsin and neutrophil elastase. The most prominent representative of this class is alpha-1-antitrypsin, a macromolecular substance that protects fragile lung tissue against self-destructive enzymatic degradation, its genetic deficiency being directly linked to early-onset pulmonary emphysema and liver cirrhosis.
• Antizymic — Preventing, halting, inhibiting, or neutralizing the fermentation process, enzyme (zyme) action, or the replication of fermentative microorganisms; a chemical substance or biological compound utilized as an antiseptic, industrial preservative, or specific enzyme inhibitor to prevent organic degradation or alteration of food and pharmaceutical products.
• Apoferment — The proteinaceous, macromolecular, and thermolabile component of a conjugated enzyme, which determines its action specificity toward a specific substrate; a constituent part of a holoenzyme. To become catalytically active, this pure protein structure requires mandatory coupling with a non-protein component called a coenzyme or cofactor.
• Apozymase — The thermolabile protein component of an enzyme (also known as an apoenzyme), which becomes catalytically active only when combined with a non-protein structure called a coenzyme or cofactor. This macromolecular structural unit specifically determines the substrate specificity of the chemical reaction within living organisms.
• Arginase — A highly crucial hydrolytic enzyme, primarily located in the cytoplasm of hepatocytes, which catalyzes the final phase of the urea cycle. This structural biocatalyst splits arginine into ornithine and urea, facilitating the efficient elimination of toxic ammonia resulting from protein metabolism and thus preventing severe neurological disorders.